Clutch.



e. RYAN Amm.

CLUTCH.

' APrLmA'nox rILnn nl sa. 1907. 907,541 t Patented Dec` 1908. s snnm-1$31`-2`f 1.

'i '23 2,6 /Il /\i E. VAN AUKEN.

CLUTCH. i

APPLIOATIOE FILEDIAE. 23, 1907.`

`. Patented Dec. 22, 1908.

2 sums-snm' 2.

UNITED STATES PAQLT OFFICE.

ULARXCE E. VAN AUKEN, Ol" YONKERS, NE\T YORK, ASSIGNUH T0 VAN LKEN MOTOR AND MACHINE WORKS, OF YONKERS. KEW YORK, A CORPGHATION Ul XEWYORK.

CLUTCH.

Specication of Letters Patent.

Patented Dec. 22, 1908.

Apicmmi fina Ham 2s, lso?. serial No, esmas.

To all irhom it may conmn:

Bo it, known that I, CLARENCE E. VAN Arnim. a citizen of the U nited Suites, resifling in Yonkers, in the county of `\\'0sichrstor .and Sluis of Xen' York7 have invcntcd cci'- ioin new and useful Improvement-s in ilufchvs, of which the following is :3. sioriiication.

l`his invention rplatrs to clutches, and has im' :in object to provide improved moans for peller slniii of :1 boul, this device is puriirli- .srly usriul, since it is n. 'well known fooi. that the longiiudinsl thrust upon ihr prop-ller shalt, when the bolli, is going ioiward, is town-rd f lzwiigiiie, and when rho limit is going luirlm'nid is :may from tho engine, and h r raking sdruntngc of this thrust for holding ih@ paris in clutching ong@ nir-nt. in oliiriant chui-h nwrhanism is se@ mi.

The clutch mechanism n l, inlzodjv reversing gears, and in which cCnsiruci-ior., when thu doviro is used upon :i [ropfllvr shalt, ihr longitudinal hrust noi# only inward 1hr engine in the forward drive of the shalt ning' hi when advantage of im: coper- :uion willi the. clutch, but thc t-luxislof the shaft away from the engine and Lim'zird the propeller whin using this for hashing or xrliou reversed may ho employed for coopera.- ion will; the reversing clutch.

When used in connection with a )irfnprller shaft, and mon` particularly with tlm shaft.

'which is used upon n motor horst, tho parts of the cluiin will he so Conslruolod Llull if -ln propvllor sii'ilies un ohslr1iction,os for insfuma, hooks ovor e, log` or striiws pier or wharf', gris tanglrd up in the canin chain, or sonic surh mishap, which lnomezn irily fonds to slop or im )0de rotation of the propeller, the Clutch will become di'sengagrd owing to the cessation of the axial thrust ol' tho snnft uiirh has bron ollec-iive in its uniperation wiil'. lln` paris of thc clutch for holding lhvso in cl'jili'hing engagement. The controlling lirir lor th rluich members may he pornriltcal lo lion? when llio pai-ris are in operaq tiro or finishing position, :unl may have a catch for holding il in position for nniinuiik ing the ps rts in idle relation. 'This 'will permit the clutch, upoi` the propeller shall; be- 55 ing impeded by engsgmnrnt with some 0bstruciion, io th'rof.' ihr iris-ihm faces out of clutching ongagvinrn, :uni causo die lever which is iloirting to pass ir the idle. or unclutched position s.: which iiwill oo locked. This will pormil, the engine io run frocand the operator mijtlun deiormine whether or not he desires to imnY-.oflzueg throw the pants into clufching oiigirgenirn and permit die Propeller io roi-aie. e5

Tile paris of ihrrlutcl ill he so (fonstruci'ed tluzii upon rhrowins in levier or op-l erating mechanism nio pos Von for bringing rhs cli-Itoh members into riuiching ongugrmentY that the rluiiliing rnngcnwnn will only im partial. The crunk shalt will he rozinng and upon bringing the clutch mems inio onfgagvment thrz'e will, be a. slight hor amount of iriiion produced sullicient to causo inox-ement of the nropollur shaft but not oquul in spoed to ihn rotation of the Omni; shrill., the clurh :winx-ning Lavor will he held in mig. pnsiiion :mii ininvziiinioly upon il: ii..-nigur:ilion of ihr romtirn of the propvllvr there will he :i slighl; longitudinal thrust of the propollfr shaft. uhiih will augnwni tho friction holiwon lh parts. Upon the o )erulor than relousiigj :he opornizing lever ilu'. conlinuvd rotation oi rho in'opollvr and the longiiudinui thrust upon Lho shalt S5 will iruzri -s^ liu.' iria-Lion of ihr, parts until they rotilc is'. unison und ille propeller shaft',

is winning in unison with the crunk shalt. 'lhzl oonlinuz'iiion of this axial or longitudinal thrust willfontinuo to hold ih': parts in their 90 rlutrhing rulution until sur o time :is they are dischi: ged hy ihr operation of thc notuuting ioviros or ln thv iismlionof thrust.

oi' rim pmpvllcrshaltA The. nhovo invniioiml fig-:norms of thc relense. oi tho cluif'h upon thv rvssniion of the. engl thrustol' thc slniir in vermin classes of boats muy ho insisted hy u ruin-h, :is for instance whore no hours :iro so constructed than at timos ihr prrqwllois :ire raised cniirely outy of the wmcrzhut. ih@ prosem illustration of ihis invention is particularly intended for the motor bont irpo of construction, in which the propeller@ aro light und rarely got out of tho writer when the boaty is running. Y i

When th. crunk shaft is stopped, tho thrust, 4;' course, will cease and the clutch will become disengaged automatically, the. operai-ing lever will assume its normal or idle position at which it will he locked autoniaticallv, so that upon the starting up ol the engine there will he no load from the driven shalt upon the motor. And when an internal combustion engine is used for driving the shaft which is to he connected u i by means of the clutch mechanism vthis will he found novanta cous l'or it might liapoen that thc engine would he turned over and started, the driven shalt connected up with it and thon for lsome reason the engine would stop. O1'- dinnrily this would require. that tho operator throw the clutches out of engagement, but in this forni ol' clutch when the engine is stopped, owing to incomplete iiring, coldness of the cylinders or some cause, the load will automatically be thrown ofi' of the engine, and the operator will have no dillieulty in turn* ing his onginosover for the purpose of starting them.

The construe-tion illustrated embodies a fixed friction face and somo co )crat-ive frionon faces which are cupa-ble of heilig s rung outwardlj` and into engagement wit i the non rieion nee. e u w: i 'e ie.

i, lf i i' vthotirdiimnot ol which latter friction face is etleeted hv means of cooperative inclined planes with halls located between them. Those co perative inclined planes constitutel ball races, as'

it were, disposed in a direction longitudinally of the shaft, that is, the axis olthc hall races will he disposed in a plane which coincides with the axis of rotation of the parts which are to be coupled. seen that the torqm` of the shaft has no influence upon the tightening of thi` elutch members, this is effected only by the longitudinal thrust. The halls are situated he tween the iii-ts of tho device which inovo longitudina ly incident to the operation o'l` the clutches and to the thrust ol the shalt, and will not only act asimti-frii1tion hearings between the parts, which so move longitudh nally, but also will act as antifriction hear` ings for the friction which would otherwise be produced by the torque. of the shaft, when this has dutv upon it, and the shaft is moved longitudinally for discngaging the clutch incinliois.

lt'hcn my,improvement is employed. in eonncotion with a propeller shalt ani' ii is dcsircd to hririg the parts into clutching rela` tion one of thi-se, thc propeller in thc presi-nt` illustration, will hegivcn a slidingr movement in the dii'coiion which it will tenu' to movc. in

' rcvcrscd.

aident to its axial thrust wliili` under dut). Whf-n ii is dcsircd io uucouple or placc ilaclizchiiionihcrs in inoperative relation thc nl. plains Ilf- .'ll liulni'cii ulrich .ne .s -ii riii mrt will lic moved in thc opposite direction, .n ilw pimientilhistraiion against iis axial thrust.

'i lrl drawnufs aocoinpanying and iorinif By this means itwill he4 embodiment ol :i forni ol' my invoniion, in which Figure l is a .side ricw ol thc mechanism with the gi ir casing or housing shown in longitudinal section. lfig. 2 is a longitudinal section on a horizontal plane ol thc mechanism illustrated in ["ig. l. Fig. il is a plan View of a motor hoat engine. and twin propcllcrs c uipped with in y prcscnt improvcini-nt. l ig. 4 is a pcrsicctirc vicw of the clutch member carried liy the driwu liai`i. Fig. 5 is a perspective vii-w ol' thi` pari for exnmding the clutch iuiinhcr. Fig. l .shows a largc detail in longitudinal .scotion of the clutch expander and the hall iii closed position. Fig. 7 illustratcnl :similar paris in an open position; and Fig. t4 is a top plan View ol thi` partsronncctcd with thi.- clutch lever detcnts.

The Crank shaft is designated h5 2d. :uid in Fig. 3 two ol' these crank .shafts arix shown for driving twin propcllers 2l niouncil upon propeller. shafts 22. Thi engine casing is designated in a general way by L. This. of course, forms no pari, of thc presi-nt improve` nient and is illustrati-d for showing the rela- `iionship hctwccn parts of the invention and those paris' which tht` clutch is particularly adapted io oonncot, nanicl.' an internal coinlnistion engine and propcllers, that is. the propeller shafts oi' twin propcllcrs with the crank shafts of'thc internal combustion cnginc having opposed pistom working upon a pair of crank shafts. The vio-.vs of the clutch mechanism parts arc .shown incascd in a housing. droignatcd in a. general way ln' 2l, and which is shown as ol` .strong enough construction io constitute not oni)I the gear cas ing hut a hearing portion 25 for the nopcller shaft. The crank shalt is .shown as liaviug a hearing 2li from the main frame ol th:` cngiuc. v

Although ono of thc clutch units has lacn ilcsi-.iihod in li-tail ject l'or thc purpose of .showing ilsadziptahilily :i pair ol ihr-fe nuits applied to the oluiffh and reversing nii-chansni ol' a piopclhr shaft will lic des! rihcil` The crank shalt har; last upon it a niitci' gcar 27 incshing` with an idler miti-r gear .H which mcshcs wii h a mii-cr gcai' 2f) loose upon a sleeve Ill, which is loosi` upon thc propcllci shaft 22, and is interposed lictwccn thc hcaring 25 and such shal 22 und has an oxlcnsion Il() licln'ccn lhc mili-r :fcar 2li and thu shall, A collar .'llfl is on this slccvc and all lords :i iliriisl hearing ln-lwccii ilnniilcrgcnr 2!) and thc hearing 23, when llol propeller is 'l`hc thrust lnaring loi' revoking thc driving ihrnst n hun thc propcllfr is rmiiiing l'oin ii'illv is .shown .is coniproiug :i pair i p i irioiiiilcd, ll is Found :ironic-sari' to :rioni Ain ann-friction iii-aria;r lor Lithia up :hc llirmi v. lifn thc props-livr is' rcvci'rlcd` `-ieicc iiv .t pari. of this specilieaiion .show a praiziiiaihlo i is ouh-` lor \l:orl periods' ol' iimc and al Laila-r fli') lIZi) A ii-N- 1 loizg'inthrvuls that the propellut is i'lvffrsed, and ntmich thurs us it i reversed high Speed is not. sfenvrnlh aattnided.

'l`lnf1niter Lfinr 2T is held betwm'n t -houl der 55 on the vrind( shnlt. amd n. 1plate 36 which if: hrltlin punition by :nouns t. u screw Ent-,h of the gem" whtl'ls 27 und 'lll' hns n which enrries it. These faces will t:n '}pi-rute CSI with them 4t) 'it respectively enrt'ivd vby mambet's -li' hit-h nre fret to' mow rtlzitive to the propellerslmft und to inni/t' llongtitudinnll,V with the uopellcr shnl't rl-httive to the. .':rmil: shaft. lhnt one ot.' the Vmembers 'l0-5; vfhivh is in the :active compil-mitm of' parts in the chut-h which is. being cout/lud or nntfouplod will have n ocirtsnn fun/mnt. ol' axial movement independently of tho movinrent' of tie 1- einher li'). ln coupling, tnliine the. inembnr 52 for exninple, vzmh the. niiu'nher tit! i@- nio'vd toward the right in Fig. 7 thfmember 52' ill more with it. rointively to the member 2G `until the Friction ffii-v 52 :infini-fw thtI irirtiuu leve .tl urti the# this moz'nnivnt ol' the member 52 will he urz/ated relitti-fe to Lt" und tite member Ci() will Inovirelzttii-'el to the members 52 und 29, 'lo t certain degree there :.i llo-lling shalt. :ind n tmmlmr nl' thv l'rirtion. "hitch, 513, llontitltly mount/fat upon this sha1-tt.

rrd-itin; te the nennt-e1* l` A ,',nx'fiort l o!" the member at! engnge shouhlnrs: i2- 53 npnn :i bend fil nl tho propeller shalt .22 :nid to which head ihn nieniher tit) is t liyed. Tho propoli-r shalt will h in its hearings. The member (it) han n un'- cunifervntiel grttove of in which ure :xn/tmb ed shoes Gti, ent'h tu whith is enrrietl hy n pivot; end (3T d a serv UH whit-h is starr/'wed into n portion ol' the :ictuzutn lever 7U. llus portion is in thtI present inSt-nnee n rin; 7l. lhe luhfrnm of tht` lever is shown us :i lmll`7. Sluiting in n socket T3 in the gaar onse. 'l he lever r irrior: n. springr :ntnxuod witch 7f3 4'0- operntiufr with e deteni T5 upon the gear 'nsintr. 'lhr position of the` detent 75 is shown :is in tht: runter nl' the pnth of niort-nient. Ul thf-l h-vf'i ond s" sitnrrled thnt itI will lof'lf. th@ lover in :L -\t .\it.- n in which it will bold l/Ulll of tho trie-t ion eluteles idle. ln some sitimtimr; it if; found highly desirable to hnve the lover limiting; exeept when ir is in n pmiiwn to h-ld hntlt ol' the vinti-hes idle. At. other tinv mitch 740 :n1-i d-trnts 750 mul im wnployed for holding.: thv parts in clutr'ling engagement irresperrivo o the thrnbt o1. ill@ l t t i i l l l f i l i i i l l t i l i parts couplud. The members -l2-52 are split :as nt -l3- 55?, making n number of {ingcrs tw-54, euch of which lingers in the pres ent instancia is shown as Cnrrying portions. of two of the hall runes -55, and each end of the number titl shown as carrying other portions 46--56 el the mecs.

ln 5 it will be secu thni there is n eircumerential Igroove. 50() around the perimeter of tho member .52. This is for tho purpose of reducing the stillness of the metal at the ends ot' the lingers 54 where these are separated or sinceri oill hy the. splits 53. The ini t that the ring` 4?52 are split. in a number of places is of advantage in providing proper rztcewuys fur tho barils, since if the rings were split ntY but one or two places, upon the expansion and contraction o1' the ring tln` halves. of entzb of the rcspectiv longitudi :nl raices would be. shifted out of position and the hulls would he. mused to bind.

Tin1 :Axes of these rucs :irc disposed nt nu tingle t the u'xi: of rotation of the vfurious parts ot' the clutch und em'h will ee. npbY a. ilane whit-h will also smh the sind axis of rotation. 'lho anglo whit'h l huwfound to bo rather' forceful in practice lor these raices. is :in :ingle of about two degrees.

greater anglo u ill net muro rapidly, that is,

the clutching: friction nnsy be :trrirvd'nt more rendita. but tho ptiwhr to hold is reliure-.d by tbc greater angle. ln nntny situations, its for instant-n in motor hunts, it is found desirable. to have the lrictionail engttguutent somewhat retarded in arriving u tits .'ull state of Glicieney und thon whtn such state of ellicienoy is nrrivnd at to 'inve the frivroo tionnl engagement of the'fztrontjest possible' Y chmhmrr.

".t'hun the rmnk einil't is runningl und the parts nre in the poition illustrated in Fig. 2 the gear wheel I7 will he. totalling;v by virtue of the [nel that it ir: fasi with the crunk shzii', it will `hetotatin;r the idlor LS which will rotute the gfnr wheel 2t) cruising this` to idlyr move about. the sleeve 3U. Upon moving the nwnxber titl toward the engine, nnnreli', toward thrlultr instit-h ligure, the bulls, designated without prt-.lti'tnce by St), will ho tort-ed in the :sume direction and running up the4 inclined pinne of the bottom of the rares 4G will engmre. the int'lined phuzes of the hottoms of the rin-es 45 und will spring the 'linfiers tl outward und into position und bring the farce. 41 into viigngeinentz with the lace 4U.

vlty will here be rennrmlwrod tlni thi` niember tit) is lust with tho propeller shaft' both :is to tho axial and angular niovenwnts thereof, imd'thnt the part 42 i:- irntcpendvnt, to a em'- tain degreex of the axial movement of the. propeller `draft. I Tpon the luces t0 and 4l bein;r loreml tt'rgether friction will lv estab lished between these, und the propeller will connneneo in rotate und to thrust the shaft longitudinlly toward the engine or toward i l s the left.. 'llie ino.'eineii't of the lever toward the lel drziws the propeller shiil't. iii this diree-tion, the direction which it normally tends to thrust, :ind :is the propeller eoiitinues its rotation the thrust will continue until the part (3l) is driven uji into the purl 42 to bring the hai-ils further up upon the inclined plaines represented hy the hottonis of the raices l5 :ind 413 und :i tight lit will he had.

.lit will he seen that the fsu-.es 4() :ind 50 iiie ril :in sine-le to their :ixus :ind the faces 4l :ind

F v 5L :im also it? :in angle. 'l his is lor permitting the fri-:tional engagement, ile he ell'ected :ind discontinued upon :i slight ,r longitudiniil movement of the imi-ts relative to eiieh :genis between the twin shafts.

The gear casing 34 shown its carrying :i hearing Ysupport which carries :i hearing bushing S6 for supporting the shaft S7 which ii'ill he fastwith tho idler 2S in the mins of struction is used in ct-rineetieii with the two t crank shafts which will he. driven hy ineens other than would. he thcl crise with :in equal i amount of clearance sind the friction l': unido cylindrical.

es t l 'l he singular relation hei tween these faces also will compensado for weer and the lil'e of the clutch will he iii-;

creased. At- 4T H57 the luces 4l5l :ire sho-wn as suhstiint hilf; :"lifdric:il :is ii-i'e also the inside fuer-.s Llli-68, which faces 4S-5S enxrgiigo the luces lll--l of the nioinher (il).

t'poii the eer'sation of the thrust, of the propeller sluilt'-, 'ifliellier this he ethic-ted hy the propeller shell enroiiiiteiing :in ohstriiw tion or ity the erotik shrill ceasing to rotatie, the sprintr iiction of the lingers 44 and tho Position ol' the hulls, iii lh iztces 45^l6 will cause the tingers to smtp or spring,r littekwiirdly sind niove' the propeller in :i reverse direction to that which it luis heen thrusting y in its work; :nid release the l'i'ieiioiiil rehit ion heiirecn the clutch ineinhers. l`he member -ll ill not. only cause the hnekviird movenn-.iil olthe. propeller slnilt lint, `will :also incidentl to the :ietioii ol the hulls upon its springr lingers more out. ol' the iiieniher 2'.) lo :i slight extent. 0l eoui'se the piii'ls muy hc discirgfiigod hy :ietuiiting the operating lever :ind pusitiveh; diziwngqr the friction luces from cizgiigeiiieiil with eiirli other.l lt um)l herel he suited that the tendency of the friction hice yll) to contract will :issisy the drswriff :ipiirt of the lrietion haces.

'hi-n it is desired to i'ofrcrse the shall or conse il lo rolzile iii :i reverse or hiichwzil'd direction it. will he. necessary to swing; the

operatingr lover, in thel pri-sent illustration` toward the right, :ind more llie propeller slnilt :muy l'roin the engine. or in the direction it will nornizill)v lend to thrustwhen riiiiiiiil t'lvversvlv :ind in which mise the l'rietion lires 5U :ind .'i! will lie hroiiglil into clutching relation. 'l'his will t hen, permit the train ol gears 27, H :nid Zl lo hecoiiie elli-.etive l'or rotating; the slizil't 22 reversoly to the rotation di' the erzinh shzil'i, Shire ilu` opvrsl `:on ol the various piti ls ol' the clutch nicch- :i.iiszii loi this sidi* or end .-irt similar if those iii-w. iouslj; dcsfrilnil lorelli-i-tinrg the noi'niiil tziil.

l l l l i i i I l l i l i l l l l l of opposed pistons working together in the engine casing :iftcr :i iniinner described in my eiipliraition for United Stai-tes Letters Petenll tiled Merch 1T, lti, Serial No. 362,260.

'i lie hodrv portions :if the ziieiiilir-.rs 415 sind 5; are sullieiently lipid to :gire a iiithe'.' stilll spring :ietion to the lingers tn-54 when these :ire forred out. ol" their noriirii position hy nieiins of the lwills Si) ruiming up inclined planes represented hy the i'iices l5-55 in conjunction with the expiinder iiieioher. L'pon the rrleiise of ine pressure which holds the expemfler nienihr-.r in its position which causes the outward expansion of the i'uigcrs this spring action is siillic-iently strong to suse 'die parts to assunte their normal or ii rlive posit-ton. For the purpose of preventing; tnt hulls Si) living sprung out, of the racen-'nys :i siiiiihlr: guard may he provided. lx1 the present. illustration this is shown coiuirising ii` spring ring (lll) located .in non' ies Gli] which constitute ii circumferential grot-Ye about the ends ril' the nieniher litt.

'lite wir Sirs-nig will in nin-ny instances he in positions where it will Le exposed to dust :u nl diri, end in. the situation illustrated in Fig. .rill he exposed et. times to wiiteix "The lever 7l) operates' through it slot Si() in the @wir Casing :and will (furry :i s'iringg (closure niet@ t?! for closing this slot. lhisiwill also eoziine the oil hiitli for the moviihlo piirts.

gland or adjusting ineiiiher is screwed iiiio the hearing; 25 for adjusting the position of the culliir Still and thereinF conipensli-tiiig for weer and liiiclliisli of the gearing. The parts nl llic engine ineltiseii within the Casing '.o not illustrated other lhsi-n to show the criiiik shalt. 20. 'i'lis crunk slizil't. in Figi. 2 is shown :is mounted iii :i sleeve or hushiiig'g 2U() und in lil. il hnlfmee or lly wheels 22H :ire shown iiinnnted upon these shall-s.

L 'llnconihiiizition with ze. rotary driver han ing :i friet ion clutch faire concentricllo its :nis ot' rotation, ol' :i driven ineinher in :txiarl :dint-nient with said driver :ind iixiiillv niov- :ihh` toward und from the suine. n work per l'orniiiigx inenilier driven hy siiid driven nieniher tlv-fling in its :ixhil working thrust. t0 more tlc simu: toward the said frio-tion chui-h hiv-e. :in cxpiiiisihle nieinher having: a t-opf-riitw friction clutch hice carried hy snirshzili mid :ixi;ili \nio\':i.hlelhereoinineiiiis his enh the :holt for expanding said menil'c. .and i-i'h-clre upon niort-nient. in the diret-tion of iin-working t liriis'l. ol' t.liesli:ilt,:iiid ni lor mildly moving the said shaft.

L'. PThe corihinntion with u. rotary drivel ...V1-ua having a friction clutch face concentric with its axis of rotation, of an axially slnftable driven member, 'a member rotatable with.

wz i chamber, of a driven member ari :illy iftable relative to the driver, an elastlcally )fields bie member movable axially on said driven member and provided'upon its outer sur ace with friction faces for engaging those in said chamber, said member being provided with bearing faces upon* its inner surface, a member carried by the drivenV member and provided with faces for engaging said actuator fac-es and expanding said moiTn abiemember, and mear-.s for shifting said driverl member for ei'eoting such expansion;

4. The con'ibination with a member provided with an internal friction face, of a member comprising a plurality of spring' lingers each having upon its outer side a frio-v iion hice and upon its inner side a longitudinally disposed portion of a ball race, and ac tions of haii races,v and balls in said race for springing said fingers outwardlv.

5. The combination with a. driver, having a friction clutch face, and a floating shaft, of

l an expansible member floating onsaid shaft f forming member on .sn tuator for said fingers haring Amating pordisposed bail races, balls in said races, and

means for shifting the shaftA for e'ect-ing the expansion of said elastlcallj," movable member.

7. The combination with a rotary driver' having e, friction clutch face concentric to its axis of rotation, of a driven shaft, in axial' alinement with said driver and axially movable toward and from thesame, a Work performing tending in its axial working thrust to' move the same toward the said friction clutch face,

a member having a cooperative. friction Glutei". i'ace carried by said shaft and axially movable thereon, means fastA with the. shaft for efl'ec-tin' the clutching engagement of said cooperative faces upon movement ofthe shaftin the direction of its Working thrust and for moving the shaft iria direc-tion oppositeits working thrust upon Adiscontinuance of said thrust.

8. The combination with a rotary driver having a friction dutch face. concentric to its axis 'of rotation, of. a driven shaft in axial alinernent with said driver and aniallyvmov-V able toward and from the'same, a workpertending in its axial working thrust to move the sanne toward the said friction clot-Ch face, on expansihle member having' a coperative friction eiuteh ac'e carried b vsaid shaft and axiall)T movable thereon, niefns fast with the shaft-for expanding said member and effective upon movement in the direction of the 1working thrust of aliy etiectiv'e for moving the shaft in a direction opposite itsworking thrustupon discoutinuanae of saidE thrust, trolled means for axialy moving the. ,said shaft.

Signed at Nos. 9-35 Murray st., New York, N. Y this 20th da): oi' March, 1907.

CLARENCE l2. 'VAN AUREX. Ylfitnesses:

CnAs. LYON Kissing., F. E. Boron.

member on said driven i" member driven member the shaft and auto1uaticl and manually con- 

